package vn.tbs.kcdk.global;

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.View;

public class WrapContentHeightViewPager extends ViewPager {

	/**
	 * Constructor
	 *
	 * @param context the context
	 */
	public WrapContentHeightViewPager(Context context) {
		super(context);
	}

	/**
	 * Constructor
	 *
	 * @param context the context
	 * @param attrs the attribute set
	 */
	public WrapContentHeightViewPager(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

		int height = 0;
		for(int i = 0; i < getChildCount(); i++) {
			View child = getChildAt(i);
			child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
			int h = child.getMeasuredHeight();
			if(h > height) height = h;
		}

		heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);

		super.onMeasure(widthMeasureSpec, heightMeasureSpec);
	}

	/**
	 * Determines the height of this view
	 *
	 * @param measureSpec A measureSpec packed into an int
	 * @param view the base view with already measured height
	 *
	 * @return The height of the view, honoring constraints from measureSpec
	 */
	private int measureHeight(int measureSpec, View view) {
		int result = 0;
		int specMode = MeasureSpec.getMode(measureSpec);
		int specSize = MeasureSpec.getSize(measureSpec);

		if (specMode == MeasureSpec.EXACTLY) {
			result = specSize;
		} else {
			// set the height from the base view if available
			if (view != null) {
				result = view.getMeasuredHeight();
			}
			if (specMode == MeasureSpec.AT_MOST) {
				result = Math.min(result, specSize);
			}
		}
		return result;
	}

}
